6_8_4修改下面的结构体,使之包含一个返回订单总价格的函数.

/*
  函数
 * struct order
 * {
 *      public string itenName; 
 *      public int unitCount;
 *      public double unitCost;
 * }
 */


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _6_8_4
{
    class Program
    {
        struct order
        {
            public string itemName;
            public int nuitCount;
            public double unitCost;

            public double end()
            { 
                double max=nuitCount*unitCost;
                return max;
            }
        }

        static void Main(string[] args)
        {
            order book;
            book.itemName = "C++ Primer 4th";
            book.nuitCount = 100;
            book.unitCost = 75;

            Console.WriteLine("书的总金:{0}", book.end());
        }
    }
}